- #1
arokisbobcat
- 8
- 1
Hi,
I am following this particular article from machinedesign.com about properly sizing a pneumatic system - http://machinedesign.com/archive/right-sizing-pneumatic-motion-systems
In the section Valve Exhaust Port, he does a calculation for the valve loss coefficient and arrives at 1.833 cfm. I have tried to follow his numbers but am not coming up with the same value. I am reaching out to the board to see if you can help me understand where the author came up with this value.
I used the equation he specified in the beginning -
Q = 22.48*Cv (((P1-P2)*P1)/(T*G))^1/2
and used the following values
Q = 9.94 cfm
P1 = 79.7 psi
P2 = 14.7 psi
T = 273 + 70 = 343
G = 1 (SG of Air)
Please let me know where I am going wrong in this equation.
Thanks
I am following this particular article from machinedesign.com about properly sizing a pneumatic system - http://machinedesign.com/archive/right-sizing-pneumatic-motion-systems
In the section Valve Exhaust Port, he does a calculation for the valve loss coefficient and arrives at 1.833 cfm. I have tried to follow his numbers but am not coming up with the same value. I am reaching out to the board to see if you can help me understand where the author came up with this value.
I used the equation he specified in the beginning -
Q = 22.48*Cv (((P1-P2)*P1)/(T*G))^1/2
and used the following values
Q = 9.94 cfm
P1 = 79.7 psi
P2 = 14.7 psi
T = 273 + 70 = 343
G = 1 (SG of Air)
Please let me know where I am going wrong in this equation.
Thanks